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Scattering from elastic sea beds: first-order theory

D R Jackson¹, A N Ivakin

¹Applied Physics Laboratory, College of Ocean and Fishery Sciences, Seattle, Washington 98105-6698, USA.

The Journal of the Acoustical Society of America

|January 24, 1998

Summary

This study models high-frequency sound scattering from irregular elastic seabeds. Shear elasticity significantly impacts sound scattering, revealing complex effects in sedimentary rock.

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Area of Science:

Geophysics
Acoustics
Oceanography

Background:

Seabed properties influence underwater sound propagation.
Irregularities like interface roughness and volume variations cause sound scattering.
Previous models often simplify seabed as fluid or neglect shear effects.

Purpose of the Study:

To develop a perturbation model for high-frequency sound scattering from irregular elastic seabeds.
To analyze the contribution of interface roughness and volume inhomogeneities to scattering.
To investigate the role of shear elasticity in sound scattering.

Main Methods:

Utilized a first-order small perturbation approximation.
Derived expressions for scattering amplitude and bistatic scattering strength.
Calculated angular dependence of scattering strength for sedimentary rock.

Main Results:

Identified interface roughness and volume inhomogeneities as key scattering sources.
Quantified the influence of compressional and shear wave speeds on scattering.
Demonstrated that shear effects are strong and complex in elastic seabeds.

Conclusions:

The developed model accurately captures sound scattering from elastic seabeds.
Shear elasticity plays a critical role, distinguishing elastic from fluid bottoms.
Findings are crucial for accurate underwater acoustic modeling and seabed characterization.

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